Yes, but things could be refined. With more resources and research thrown at it, it could become more versatile, that's why the title of the post says "could". And chances are, there are private and government entities already doing this. Research like this has been coming out for at least a decade now.
Even Xfinity has motion detection in homes using this technique now:
Even Xfinity has motion detection in homes using this technique now:
https://www.xfinity.com/hub/smart-home/wifi-motion